名词
中文翻译：外层电子发射同义词
同义词：
['excitation', 'electron emission']
例句：
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1. The device is designed to emit electrons at a specific frequency.
该设备设计为在特定频率发出电子。
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2. In the process of photoelectric conversion, electrons are emitted from the surface of the semiconductor.
光电转换过程中，电子从半导体表面发射出来。
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3. The electron emission process is crucial for understanding how materials conduct electricity.
电子发射过程对于理解材料导电至关重要。